Abstract
The designs of two test pattern generators for pseudoexhaustive testing have been presented. These designs are capable of implementing test sets (recipe cubes) that exhaustively test the segments of a circuit. The application of each test set requires two control bits per circuit input. The test-pattern generators can be reconfigured by simple control circuitry to apply each of the test sets of a pseudoexhaustive test in sequence. The first design, based on multiplexers, uses very little hardware. The second design is a reconfigurable counter. Both of the designs presented can be used with built-in self-test (BIST) and or scan-path testing. In addition to higher fault coverage than single stuck-at testing, the use of these designs can sometimes offer reduced on-chip storage requirements and reduced testing time.

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